Note 2 - Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2016

Accounting Policies [Abstract]

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	2016			2015
Dividend yield(1)		0.0%			0.0%
Expected volatility(2)	47.59%	to	52.54%	53.78%	to	56.00
Risk-free interest rate(3)	1.23%	to	1.82%	1.49%	to	1.95
Expected life(4) (years)	5.5	to	7.0	5.5	to	7.0
Assumed forfeiture rate		10.0%			19.0%

Schedule of Share-based Compensation, Activity [Table Text Block]

	2016		2015
Stock based compensation expense recognized	$	171,000	$	118,000
Number of unvested stock options		1,254,226		1,220,026
Fair value of unvested stock options	$	2,418,303	$	1,911,407
Amount remaining to be recognized as expense	$	1,690,057	$	1,335,438

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

	Three Months Ended March 31,
	2016		2015
Net income - basic and diluted	$	1,085	$	528
Weighted average shares outstanding		37,837		37,816
Net income per share – basic	$	0.03	$	0.01
Weighted average shares outstanding (including dilutive CSEs)		38,269		38,047
Net income per share – diluted	$	0.03	$	0.01

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

	Three Months Ended March 31,
(in thousands)	2016		2015
Anti-dilutive securities
Share based compensation awards		2,059		1,756
Convertible securities		1,662		1,662
Total anti-dilutive securities		3,721		3,418